Re: [PATCH 2/8] video: Provide screen_info_get_pci_dev() to find screen_info's PCI device

Hi

Am 29.01.24 um 12:04 schrieb Javier Martinez Canillas:

Thomas Zimmermann [off-list ref] writes:

quoted

Add screen_info_get_pci_dev() to find the PCI device of an instance
of screen_info. Does nothing on systems without PCI bus.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---

[...]

quoted

+struct pci_dev *screen_info_pci_dev(const struct screen_info *si)
+{
+	struct resource res[SCREEN_INFO_MAX_RESOURCES];
+	size_t i, numres;
+	int ret;
+
+	ret = screen_info_resources(si, res, ARRAY_SIZE(res));
+	if (ret < 0)
+		return ERR_PTR(ret);
+	numres = ret;
+

I would just drop the ret variable and assign the screen_info_resources()
return value to numres. I think that makes the code easier to follow.

The value of ret could be an errno code. We would effectively return NULL for errors. And I just noticed that the function docs imply this. But NULL is also a valid value if there is no PCI device. I'd prefer to keep the errno-pointer around.

Best regards
Thomas

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)